Really?
Broken lobbies, auto-join button takes you to full servers, servers that don't match preferences at all, or take 5 minutes of your time to do nothing at all, custom maps that have a horrible support system where you need to install the map beforehand, useless Face Poser tool, relatively high sysreq, unbalanced versus mode with very bad hunter/smoker/boomer detection, exploits abound, the entire combat value is reduced to the overuse of the right mouse button, which they even had to nerf in a way that didn't fit well, any idiots on your team will instantly result in your loss, griefing everywhere, friendly fire is super easy when you walk through your teammates, bots will 'heal' you as you stand in fire, the tank can down your entire team through the use of small physics objects or instant-KILL you all by knocking you off ledges, horrible "ledge hanging" physics in which people hang onto objects 2 feet off the ground, and A SEQUEL COMING OUT A YEAR LATER.
Don't get me wrong. Killing Floor has its issues. But I FREAKING. DARE YOU. TO SAY THAT AGAIN.
PS. Not flaming you, just L4D.